Electric Heat Exchanger Calculation

For example suppose the final solution temperature is 140f and the temperature of the steam at 10 psi is 239f.

Electric heat exchanger calculation.

For example if you know the power generated inside the unit assume 10 of the energy is dissipated as heat. Determine the heat generated inside the enclosure. Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations. The lmdt is the logarithmic average of the temperature differences at each end of the heat exchanger.

In an isolated system given heat is always equal to taken heat or heat change in the system is equal to zero. As you calculate the required surface area of the heat transfer device you see where each t value is used. If two objects having different temperatures are in contact heat transfer starts between them. Calculations of heat transfer conservation of energy theorem is also applied to heat transfer.

Approximations may be necessary. Exergy llc 320 endo boulevard garden city ny 11530 phone. The amount of heat given is equal to the amount of heat taken. Once lmdt and power have been calculated the heat exchanger calculation can be done as per the following formula.

T 2 239 140 99f. For heat transfer from the outside calculate the area exposed to the atmosphere except for the top of the control panel. The value of t 2 variation will be used in the basic equation a q u t. They will also calculate the number of tubes needed for a shell and tube heat exchanger and to calculate the pipe length needed for a double pipe heat exchanger.

To solve the basic equation a q u t you must first determine the value of. Heat transfer coefficient in kw c m 2 that is specific to each type of equipment and given by the manufacturer.